mgcp: add VTY Option to force-realloc endpoints

Currently the force_realloc feature is turnd on and of in a
hardcoded way. This patch makes the option available via VTY.

Change-Id: Ic8740512c5ea0766ff6ceb1c28b9c2b3fe46e75f
diff --git a/src/osmo-bsc_mgcp/mgcp_main.c b/src/osmo-bsc_mgcp/mgcp_main.c
index 4ea0700..6cf9ab7 100644
--- a/src/osmo-bsc_mgcp/mgcp_main.c
+++ b/src/osmo-bsc_mgcp/mgcp_main.c
@@ -218,6 +218,8 @@
 	cfg->get_net_downlink_format_cb = &mgcp_transcoding_net_downlink_format;
 #endif
 
+	cfg->trunk.force_realloc = 1;
+
 	vty_info.copyright = openbsc_copyright;
 	vty_init(&vty_info);
 	logging_vty_add_cmds(NULL);